Neutron detection technology is a powerful method for characterizing fundamental and industrial materials such as magnetic materials, nanomaterials, polymers, and biological substances. Compact pulsed neutron source is desired since the traditional way of producing high-yield neutrons depends mainly on large-scale accelerator or fission reactor. Here, we propose a scheme to generate high-yield pulsed neutron source by using >100 fs relativistic laser pulse interacting with micro-structure assisted pitcher-catcher target. Three-dimensional particle-in-cell and Monte Carlo hybrid simulations demonstrate that energetic deuterium ion beam with a cutoff energy of 75 MeV and 7.23% laser-to-deuterium energy conversion efficiency can be obtained with a laser pulse of intensity 1.37e20 W/cm2, duration 330 fs, power 34 TW and energy 6.7 J. When they strike the following lithium fluoride converter of thickness 2 cm, a large number of neutrons are thus produced via 7Li(d,n) nuclear reaction. The neutron yield is up to 10e9 and its pulse duration is as short as 20 ps. This scheme could be realized in laboratories with current hundreds-of-terawatt or multi-petawatt laser facilities
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